<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>
                </el-col>
            </el-row>
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChanged" clearable></el-cascader>
                </el-col>
            </el-row>
            <!-- 标签页 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible = true">添加参数</el-button>
                    <el-table :data="manyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i, scope.row)">{{ item }}</el-tag>
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                                    @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible = true">添加属性</el-button>
                    <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i, scope.row)">{{ item }}</el-tag>
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                                    @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数对话框 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="formRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数对话框 -->
        <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editForm" :rules="formRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 所有商品分类列表
            cateList: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 级联选择框绑定的数组
            selectedCateKeys: [],
            // 被激活的页签的名称
            activeName: 'many',
            // 动态参数数据
            manyTableData: [],
            // 静态参数数据
            onlyTableData: [],
            // 控制对话框的隐藏
            addDialogVisible: false,
            editDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            // 修改参数的表单数据对象
            editForm: {
                attr_name: ''
            },
            // 表单的验证规则
            formRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类列表
        async getCateList() {
            const { data: result } = await this.$http.get('categories')
            if(result.meta.status !== 200) return this.$message.error('获取商品分类失败！')
            this.cateList = result.data
        },
        // 级联选择框变化
        handleChanged() {
            this.getParamsData()
        },
        // 页签点击事件
        handleTabClick() {
            this.getParamsData()
        },
        async getParamsData() {
            // 选中不是三级分类
            if(this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 根据所选分类id和所处面板获取参数
            const { data: result } = await this.$http.get(`categories/${this.catId}/attributes`, { params: { sel: this.activeName } })
            if(result.meta.status !== 200) return this.$message.error('获取参数列表失败！')
            result.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制每一个文本框的显示和数据绑定
                item.inputVisible = false
                item.inputValue = ''
            })
            if(this.activeName === 'many') {
                this.manyTableData = result.data
            }else {
                this.onlyTableData = result.data
            }
        },
        // 监听对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return 
                const { data: result } = await this.$http.post(`categories/${this.catId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(result.meta.status !== 201) return this.$message.error('添加参数失败！')
                this.$message.success('添加参数成功！')
                this.getParamsData()
                this.addDialogVisible = false
            })
        },
        // 修改参数
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                const { data: result } = await this.$http.put(`categories/${this.catId}/attributes/${this.editForm.attr_id}`,
                {
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })
                if(result.meta.status !== 200) return this.$message.error('编辑参数信息失败！')
                this.$message.success('修改参数信息成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 删除参数
        async removeParams(attrId) {
            const confirmResult = await this.$confirm('此操作将永久删除该参数，是否继续？', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(error => error)
            if(confirmResult !== 'confirm') {
                return this.$message.info('已取消删除')
            }
            const { data: result } = await this.$http.delete(`categories/${this.catId}/attributes/${attrId}`)
            if(result.meta.status !== 200) return this.$message.error('删除参数失败！')
            this.$message.success('删除参数成功！')
            this.getParamsData()
        },
        // 展示修改对话框
        async showEditDialog(attrId) {
            const { data: result } = await this.$http.get(`categories/${this.catId}/attributes/${attrId}`, {
                params: { attr_sel: this.activeName }
            })
            if(result.meta.status !== 200) return this.$message.error('获取参数信息失败!')
            this.editForm = result.data
            this.editDialogVisible = true
        },
        // 文本框失去焦点或按下enter
        handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false  
                return ''
            }
            // 如果没有return，需要后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            // 保存参数
            this.saveAttrVals(row)
            row.inputVisible = false 
        },
        // 将attr_vals保存到数据库
        async saveAttrVals(row) {
            // 保存参数
            const { data: result } = await this.$http.put(`categories/${this.catId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if(result.meta.status !== 200) return this.$message.error('修改参数项失败！')
            this.$message.success('修改参数项成功！')
        },
        // 从按钮切换成输入框
        showInput(row) {
            row.inputVisible = true
            // 文本框自动获得焦点
            // $nextTick: 等待页面被重新渲染后，执行回调函数
            this.$nextTick(() => this.$refs.saveTagInput.$refs.input.focus())
        },
        // 删除参数可选项
        handleClosed(i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }
    },
    // 计算属性
    computed: {
        // 按钮被禁用则返回true
        isBtnDisable() {
            if(this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 选中的三级分类的id
        catId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 计算标题文本
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }else {
                return '静态属性'
            }
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin-right: 15px;
}
.input-new-tag{
    margin-top: 4px;
    width: 250px;
}
</style>
